Scam Of An App! Do Not Purchase iDrama Subscription!

Today I started a subscription with iDrama, but I cannot find any option to cancel it as stated. The app says that the subscription can be managed via the Apple subscription page, however iDrama does not appear anywhere on that Apple subscription list, and there is also no cancellation option inside the app itself. To resolve this, I have already sent an email to iDrama and also used the feedback option within the app, but I have not received a clear solution yet. I am worried about being charged in the future for a subscription that I am currently unable to manage or cancel through the usual channels. I request that my subscription be cancelled immediately, that I receive written confirmation of this cancellation, and that no charges are made to me now or in the future in relation to this subscription.